DCM2: AC incomplete, replaced (2) 16x25x1 filters. Front system is operating within manufacturer specifications at this time refrigerant pressures and temperatures are appropriate for indoor and outdoor weather conditions. Found blower wheel dirty and some insulation starting to fall off return duct. Furnace 2019, indoor coils 2017, condenser 2016 Back system is not operational found fan relay stuck closed causing system to run continuously even when system was off, control board has failed only sending 14v when receiving 28v found burn mark on back of control board. Blower wheel is dirty. Unable to check a/c at this time due to control board faults. Furnace 2018, indoor coils 2016, condenser 2016. Talked to homeowner he decided to have comfort advisor give quote on upgrading furnace. Will complete maintenance once system is repaired or replaced. Photos attached. For comfort advisor- system on right in the attic, system not stickered on outdoor.